The horrifying events in Las Vegas on Sunday night mark the 273rd mass shooting in the U.S. in the 275 days that have passed so far in 2017, according to Gun Violence Archive. Mass shootings are a near daily occurrence in America, but what happened in Las Vegas stands out: It was the deadliest such incident in U.S. history, with more than 50 killed and 200 injured.

The U.S. ranks No. 1 in the world in terms of firearms per capita—with 88.8 guns per 100 people—and it has the highest homicide-by-firearm rate in the developed world. The problem is so endemic that gun violence is now the third leading cause of death for children in the U.S. An average of 1,297 children die annually from gun-related injuries, according to a June 2017 study published in the journal Pediatrics. Guns are linked to roughly 33,000 deaths in the U.S. per year, according to the Centers for Disease Control and Prevention; about two-thirds of them are suicides.